A little history to start. YES, I have read every brake bleed and LSPV thread I could find.
When I bought my 80 about a year ago, The brakes were spongy. Found that the MC was recirculating fluid and was bad. I replaced the MC and bled it properly, about 8 times through the system both manually and with a vacuum bleeder. Brakes better but still a bit spongy.
Worked on determining why I was spongy and discovered the DS rear caliper was seized/ineffective. replaced it and lots more bleeding. Better, but still spongy.
A few things that I worry about. "HISS" when holding brakes at start-up...possible leak from booster? The Vacuum line from the booster to the engine is fine, have checked it repeatedly. The hiss seems to come from the area of the brake pedal, Unable determine source.
Recently took the truck in for State Inspection. They conduct a Skid test here. DS brake application failed. the other 3 are working great.
When I run through bleed again, I get very little fluid flow at the DS rear caliper. I take the line off at the caliper entrance and get better flow, but it's a new caliper with new fluid and lots and lots and lots of bleeding.
Is there a reason why the LSPV would not transfer some brake pressure to the DS, but is doing fine to the PS?.
I am not yet lifted and have not played with the BPV or LSPV other than to bleed the LSPV.
Suggestions would be helpful. Have read every post I could find and not sure what my solution is going to be. Have 2 weeks to pass re-test.
When I bought my 80 about a year ago, The brakes were spongy. Found that the MC was recirculating fluid and was bad. I replaced the MC and bled it properly, about 8 times through the system both manually and with a vacuum bleeder. Brakes better but still a bit spongy.
Worked on determining why I was spongy and discovered the DS rear caliper was seized/ineffective. replaced it and lots more bleeding. Better, but still spongy.
A few things that I worry about. "HISS" when holding brakes at start-up...possible leak from booster? The Vacuum line from the booster to the engine is fine, have checked it repeatedly. The hiss seems to come from the area of the brake pedal, Unable determine source.
Recently took the truck in for State Inspection. They conduct a Skid test here. DS brake application failed. the other 3 are working great.
When I run through bleed again, I get very little fluid flow at the DS rear caliper. I take the line off at the caliper entrance and get better flow, but it's a new caliper with new fluid and lots and lots and lots of bleeding.
Is there a reason why the LSPV would not transfer some brake pressure to the DS, but is doing fine to the PS?.
I am not yet lifted and have not played with the BPV or LSPV other than to bleed the LSPV.
Suggestions would be helpful. Have read every post I could find and not sure what my solution is going to be. Have 2 weeks to pass re-test.